Hurricane Local Statement

Hurricane Hilary Local Statement Advisory Number 9
CAZ038-087-088-346>358-362-366>383-548>550-190600-

Hurricane Hilary Local Statement Advisory Number 9
National Weather Service Los Angeles/Oxnard CA EP092023
858 AM PDT Fri Aug 18 2023

This product covers portions of Southwest California

Hilary to produce rare and dangerous flash flooding and tropical
storm-force winds.

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
- A Tropical Storm Watch has been issued for Catalina and Santa
Barbara Islands, Antelope Valley Foothills, San Gabriel
Mountains, Interstate 5 Corridor, Santa Clarita Valley, and
Highway 14 Corridor

* CURRENT WATCHES AND WARNINGS:
- A Tropical Storm Watch has been issued for Catalina and Santa
Barbara Islands, Antelope Valley Foothills, San Gabriel
Mountains, Interstate 5 Corridor, Santa Clarita Valley, and
Highway 14 Corridor

* STORM INFORMATION:
- About 1150 miles south-southeast of Avalon CA or about 1190
miles south-southeast of Los Angeles Airport CA
- 17.9N 111.4W
- Storm Intensity 145 mph
- Movement Northwest or 305 degrees at 10 mph

SITUATION OVERVIEW
------------------

Hurricane Hilary will weaken to a tropical storm as it approaches
Southern California this weekend. Flash flooding will be possible
across Los Angeles and Ventura Counties, and perhaps Santa Barbara
County. Rare and dangerous flooding possible across the mountains.
Tropical-storm-force winds will be possible Sunday into Monday.

POTENTIAL IMPACTS
-----------------

* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
extensive impacts across Los Angeles and Ventura Counties, and possibly
Santa Barbara County. The most dangerous conditions are expected over
the mountains. Potential impacts include:
- Major rainfall flooding may prompt many evacuations and rescues.
- Small streams, creeks, canals, arroyos, and ditches may become
dangerous rivers. Destructive runoff may rage down mountain
valleys while increasing susceptibility to rockslides, mudslides,
and debris flows. Flood control systems and barriers may become
stressed.
- Streets and parking lots become rivers of moving water with
underpasses submerged. Driving conditions become dangerous. Many
road and bridge closures with some weakened or washed out.

Prepare for dangerous rainfall flooding having possible limited to
significant impacts elsewhere across the area.

* WIND:
Prepare for hazardous wind having possible limited impacts across Los
Angeles and Ventura Counties, with greatest impacts over Catalina
Island and Santa Barbara Island, as well as the mountains of Los
Angeles County. Potential impacts in this area include:
- Damage to porches, awnings, carports, sheds, and unanchored
mobile homes. Unsecured lightweight objects blown about.
- Many large tree limbs broken off. A few trees uprooted, but with
greater numbers in places where trees are shallow rooted. Some
fences and roadway signs blown over.
- A few roads impassable from debris, particularly within urban
or heavily wooded places. Hazardous driving conditions on
bridges and other elevated roadways.
- Scattered power and communications outages.

Elsewhere across Southwest California, little to no impact is
anticipated.

* SURGE:
Little to no impacts are anticipated at this time across Southwest
California. However, coastal flooding will be possible especially
around Catalina Island and Long Beach.

* TORNADOES:
Little to no impacts are anticipated at this time across Southwest
California.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* EVACUATIONS:
Listen to local official for recommended preparedness actions,
including possible evacuation. If ordered to evacuate, do so
immediately.

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.

When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.

If in a place that is vulnerable to high wind, such as near large
trees, a manufactured home, upper floors of a high-rise building, or
on a boat, plan to move to safe shelter.

If you live in a place particularly vulnerable to flooding, such as
near the ocean or a large inland lake, in a low-lying or poor
drainage area, in a valley, or near an already swollen river, plan to
move to safe shelter on higher ground.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Los Angeles/Oxnard CA around 3PM PDT, or sooner if
conditions warrant.

$$